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A severe weather warning has been issued for Brisbane and southeast Queensland, as a south-moving trough brings heavy rains and flash flooding.
Areas from central Queensland to the NSW border are expected to be deluged from this afternoon (local time) and into tomorrow morning, the weather bureau says.
"It's roughly the entire southeast quarter of Queensland," Bureau of Meteorology forecaster Mark Trenorden told AAP.
"The heavier rainfall is going to slowly contract to the southeast of the state."
The severe weather warning covers Brisbane and Ipswich, along with the Gold and Sunshine coasts.
The Wide Bay, Burnett, Darling Downs, Granite Belt, Central Highlands, Maranoa and Warrego areas are also affected.
Mr Trenorden said the trough would concentrate heavier falls today and into tomorrow from Rockhampton in central Queensland to Goondiwindi in the south, before breaking into showers and thunderstorms by the weekend.
It means the coastal areas from Yeppoon in central Queensland to the NSW border are expected to experience flash flooding, with falls of between 50mm to 150mm.
Minor flood warnings have also been issued for river areas in other rain-affected parts of the state.
Rain has already bucketed down on the state's central coast, with Pacific Heights near Yeppoon receiving 324mm in the 24 hours to 9am (AEST).
Yeppoon itself had 296mm, causing flash flooding, while further south at Mt Larcom, 217mm fell and Tully in north Queensland had 204mm.
"So there's been some very heavy falls along the coast from about Tully southwards," Mr Trenorden said.
It's unfortunate news for graziers in the state's west, who are battling while 80 per cent of Queensland has been drought declared.
"I guess the heavier rainfall has been fairly coastal, so it won't necessarily help them a great deal," the forecaster said.
Emergency Management Queensland regional director Wayne Hepple said several homes and businesses had been significantly damaged by fast flowing floodwaters in Yeppoon.
"From what I understand there were houses on hills where the rainfall event has gone down the driveway and gone through the house and the small drains around the houses have just been unable to cope," he told AAP.
"Today is basically an assessment of the levels of damage and what clean-up and assistance the community needs."
Mr Hepple said the sudden, hard downpour meant it was difficult to react.
About 30 State Emergency Service volunteers had worked overnight to mend leaking roofs and help with sandbagging, he said.